Question

我创建了一个名为“AddNumbers”的函数，但是当我调用它时，我收到一条错误，上面写着“需要一个对象引用”。我已将此函数放在Main（）入口点之外，但我确信它与放置无关，因为我尝试移动它并且它仍然无效。

namespace FunctionPractice
{
     class Program
     {
        public int AddNumbers(int number1, int number2)
        {
            int result = number1 + number2;
            return result;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("Enter 2 numbers: ");
            int firstNumber = Convert.ToInt16(Console.ReadLine());
            int secondNumber = Convert.ToInt16(Console.ReadLine());

            int result = AddNumbers(firstNumber, secondNumber);
            Console.WriteLine(result);
        }
    }
}

Answer 1

Si static为AddNumbers，' Code Block to prevent pasting Images with PasteSpecial If IsClipboardContentInExcelFormat Then Selection.PasteSpecial Paste:=xlValues Else Selection.Value = GetClipBoardText End If Function GetClipBoardText() ' src: http://stackoverflow.com/questions/9022245/get-text-from-clipboard-using-gettext-avoid-error-on-empty-clipboard Dim DataObj As MSForms.DataObject Set DataObj = New MSForms.DataObject '<~~ Amended as per jp's suggestion Dim myString As String On Error GoTo ErrorHandling DataObj.GetFromClipboard '~~> Get data from the clipboard. myString = DataObj.GetText(1) GetClipBoardText = myString Exit Function ErrorHandling: If Err <> 0 Then MsgBox "Data on clipboard is not text or is empty" End Function ' Will use MSForms.DataObject for geting clipboard content ' reference: http://stackoverflow.com/questions/9022245/get-text-from-clipboard-using-gettext-avoid-error-on-empty-clipboard ' reference: http://msdn.microsoft.com/en-us/library/office/ff839748%28v=office.14%29.aspx Private Function IsClipboardContentInExcelFormat() As Boolean IsClipboardContentInExcelFormat = False On Error GoTo ErrorHandling Dim aFmts, fmt aFmts = Application.ClipboardFormats For Each fmt In aFmts If (fmt = xlClipboardFormatBIFF _ Or fmt = xlClipboardFormatBIFF12 _ Or fmt = xlClipboardFormatBIFF2 _ Or fmt = xlClipboardFormatBIFF3 _ Or fmt = xlClipboardFormatBIFF4 _ ) Then IsClipboardContentInExcelFormat = True Exit Function End If Next Exit Function ErrorHandling: If Err <> 0 Then MsgBox "Cannot Read Data in Clipboard" End Function也必须是静态的。

Answer 2

嘿你的方法工作得很好你只需要让你的“AddNumbers”方法静态。您不能从静态方法中调用非静态方法。此外，您可能希望在末尾添加读取行，以便程序在写入屏幕后不会关闭。这将是固定代码。

class Program
{
    public static int AddNumbers(int number1, int number2)
    {
        int result = number1 + number2;
        return result;
    }

    static void Main(string[] args)
    {
        Console.WriteLine("Enter 2 numbers: ");
        int firstNumber = Convert.ToInt16(Console.ReadLine());
        int secondNumber = Convert.ToInt16(Console.ReadLine());

        int result = AddNumbers(firstNumber, secondNumber);
        Console.WriteLine(result);
        Console.ReadLine();
    }
}

Answer 3

让你的功能成为 public static int AddNumbers(int number1, int number2)。

这是因为，您正在从属于类本身的静态函数调用您的函数。您的函数属于该类的对象。因此，当您调用静态函数main()时，它不知道要调用哪个实例AddNumbers。因此错误。请详细了解static关键字。

Answer 4

将方法声明更改为

 public static int AddNumbers(int number1, int number2)

或者在main方法中创建Program类的实例，然后访问add numbers方法。

 namespace FunctionPractice
 {
      class Program
      {
         public int AddNumbers(int number1, int number2)
         {
             int result = number1 + number2;
             return result;
         }

         static void Main(string[] args)
         {
             Console.WriteLine("Enter 2 numbers: ");
             int firstNumber = Convert.ToInt16(Console.ReadLine());
             int secondNumber = Convert.ToInt16(Console.ReadLine());

            Program program = new Program();

            int result = program.AddNumbers(firstNumber, secondNumber);
            Console.WriteLine(result);
        }
    }
}

我的C＃功能不起作用

4 个答案: